php70.rb: initiate bottle build
php70.rb: initiate bottle build

Closes #1935.

Signed-off-by: Alan Ivey <ee249fd9166eccef852f50ca0cbb6ff8665afe99@gmail.com>

philcook/homebrew-php,dguyon/homebrew-php,mkalkbrenner/homebrew-php,TomK/homebrew-php,ablyler/homebrew-php